| abstract |
Synthesis procedure of a compound of formula (I) ** Formula ** in which the meaning of R is a dimethylamino or acetyl group, characterized by a) reacting a compound of formula (III) or (IV), ** Formula ** in which the meaning of R 'is a dimethylamino or 2-methyl-1,3-dioxolan-2-yl group, with methoxymethyl lithium, b) removing the protecting groups from the intermediate thus obtained, c) acylating the group hydroxyl at position 17 of the compound thus obtained. |